Dynamo-electric machine.



H. H. RALSTON.

DYNAMO ELECTRIC MACHINE.

APPLIGATION FILED JAN.27, 1905.

1,028,965, Patented June 11, 1912.

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l-IOVV'ARD H.

BALSI'ON, OF NQRW'OOD, OHIO, ASSIGNOR TO THE BULLOCK ELECTRICIVIANUFACTURING COMPANY, A CORPORATION OF OHIO.

DYNAlViO-ELECTB-IC MACHINE.

Specification of Letters Patent.

Patented June ii, 191

Application filed 5211111213 27, 1905. Serial No. 242,822.

To all whom it may concern:

Be it known that I, HOWARD H. R.=\Ls'roN, citizen of the United States.residing at Norwood, in the county of Hamilton and State of ()hio, haveinvented certain new and useful Improvements in DynamoElec tricMachines, of which the following a full, clear, and exact specification.

My invention relates to dynamo electric machines and especially to theconstruction and arrangement of the commutators of said machines and theconnections between the commutator segments and the armature coils. Itis essential in making the connections between the commutator segmentsand the armature coils to secure perfect electrical contact and aconsiderable degree of mechanical strength.

The object of my invention is therefore to simplify the method of makingthese con nections and to minimize the liability of the commutatorsegment and connections pullingapart during the operation of themachine.

The invention in one of its aspects, comprises the method of fastening'a commutator connector to a commutator segment, said method consistingof slotting one end of the commutator segment, and then placing in theslot thus formed a connector with an opening or cut-away portiontherein, and then forcing into the opening of said connector part of themetal of the segment adjacent to said opening.

In another aspect my invention comprises the combination with acommutator segment having one end slotted, of a commutator connector inthe slot in said segment, said connector having an opening or cut-awayportion and part of the metal of the segment adjacent to the opening orcut-away portion of said connector being forced into said opening afterthe parts are assembled.

My invention still further consists in the details of construction andin the combinations of elements described in the specification and setforth in the appended claims.

In the accompanying drawings, which illustrate the preferred embodimentof my invent-ion, Figure 1 is an elevation partially in section of anarmature equipped with my invention; 2 is an end view of a pair ofcommutator connectors one of which is attached to a commutator segmentin accordance with my invention; 3 is a view similar to Fig. 2, showinga slightly different form of commutator connector: Fig. 4C is a sideelevation of a part of the commutator segment and its connector; Fig. 5is a sectional elevation on line 5 5 of Fig. f; Fig. 6 is a side view ofthe inner end of the commutator connector, showing the preferred shapeofthe opening in said connector; Fig.1.. 7 and S are side and end viewsrespectively of the outer end of commutator connector, showing thepreferred means for connecting said commutator connector to the armaturecoils; Figs. 9, 10. and 11 are views of the outer part of the commutatorconnector dismantled; and Figs. 12 and 13 are side and end elevationsrespectively of a modified form of connection between commutator segmentand connector.

Referring now to the figures of the drawings, the armature A is providedwith a laminated core D and armature coils F connected to the segmentsof commutator B mounted in the frame 18, which is fastened to the shaftC in a customary manner. Each commutator segment has a slotted end 1 towhich the connector or connector-neck 15 is attached in accordance withmy invention. The end 14 of the commutator segment is sawed, orotherwise slotted on a radial plane, the slot being of a width justsuflicient to admit the connector 15, the inner end of which has acut-away portion or opening 17. After the connector 15 is placed inposition in the slot formed in the commutator segment, the material ofsaid segment adj acent to said opening, that is, a part of the metal inthe side 14 (Figs. and 13), is forced into the opening or cut-awayportion 17 preferably by means of a die, or embossing tool, which issimilar in shape tothe open ing or cut-away portion 1'7, but of aslightly smaller size. The commutator segments and connectors thusfastened together are clearly shown in Figs. 2 to 5 inclusive.

It may be desirable for the purpose of increasing the current carryingcapacity of the connector to use several of. said connectors in paralleland fasten same to a single commutator segment. In Fig. 2 I have shownmy invention applied to a single commutator connector fastened to asingle commutator segment, and in Fig. 3 a double commutator connector15 fastened to a single commutator segment 12.

In the slightly modified form of my invention shown in Figs. 12 and 13,the side of connector 15 is cut-away to form an open ing or recess 17into which the material of the segment is forced by a properly shapedembossing tool.

The outer end of commutator connector 15 shown in Fig. 2 has rivetedthereto at 18 a strip 19, which together with the outer end of saidconnector forms a pocket to receive the end or ends of the armaturecoils E. These coil ends are soldered or otherwise fastened in saidpockets. In Fig. 3 the outer end of a double commutator connector 15 hasits members spread apart to form a pocket to receive the ends of saidarmature coils. The adjacent connectors are separated from each other attheir outer ends by insulating strips or wedges 20. To avoid the use ofrivets in the commutator connectors, I prefer to use the arrangementshown in Figs. 7 to 11 inclusive. In this arrangement the outer end ofthe flat strip forming the connector 15 is bent at 21 into aplaneparallel to the remainder of the connector and justbelow said bend 21 aplurality of rectangular holes 22 are formed.

The auxiliary strip 23'shown more clearly in Figs. 10 and 11 is punchedto form the ears or tabs Q l which are adapted to pass through theopenings 22 and have their ends bent as shown at 25 in Figs. 7 and 8.This arrangement forms a simple, inexpensive and readily assembledstructure which provides a pocket at 26 to receive the ends of thearmature coils E.

I aim in the appended claims to cover all modifications which do notdepart from the spirit of my invention.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is 1. As an article of manufacture, acommutator segment having one end slotted, combined with a connectorconsisting of a flat strip of conducting material having an opening orcut-away portion in one end, said strip fitting in the slot in saidsegment and part of the material of said segment adjacent to the openingin said connector filling said opening.

2. A connnutator segment comprising a bar having a slot, and anextension or neck having an apertured end seated in said slot. the sideof the bar being locally depressed into the aperture.

In testimony whereof I affix my signature, in the presence of twowitnesses.

HOXVARD H. RALSTON.

Witnesses L. LowENBnRc, FRED J. KINsEY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. C."

